Really not much to it. I found the engine on CL advertised as a 354. Brought it home and discovered is was a heavy duty truck 331. The seller even insisted on refunding me 100 bucks, even though I told him please don't, because I was happy with the purchase.
I went through it top to bottom. Put the one year only 8.5:1 1955 pistons in it. We milled the heads only .025" which brought it up to 9.3:1. The reason is because how the chambers are made. It doesn't take much to make a BIG difference because you're removing from the ENTIRE half sphere of the chamber.
I had Oregon Cam Grinders grind a nasty small solid out of the original hydraulic. .453, 240 @ .050" ground on a 106. I wanted low lift, because the exhaust rockers are very long ans cannot take a lot of spring pressure. Me and Desktop Dyno figure about 350 or so HP and maybe a little more in torque. All that's not really important as it's going to look and sound ominous. Especially with home made zoomies. lol
That intake manifold is a pretty rare piece. Factory two one barrel intake with trans dapt one to two barrel adapters and two GM 2GC carburetors. The transmission behind it is a late 70s Dodge truck 4 speed over drive. The chassis is a 83 D150 with a Dana 70 dually rear and one ton front stuff. I have sorta neglected it, but it is fixin to come to the front when I get the Valiant tagged and start driving it.